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Once the tool shows "Flashing Completed," disconnect the device and power it on. If the phone was stuck on "Contact Service," it should now boot to the main menu. For further official device support, you can visit the Nokia 150 User Guide HMD Support Page is best for your current setup?
A flash file, also known as a firmware or ROM, is a type of software that is used to control the functionality of a mobile phone. It contains the operating system, user interface, and other applications that come pre-installed on the device.